One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,8)(5,14)(6,11)(7,12)(10,15)(13,16)(20,28)(24,29)(26,32)(30,31)(33,34)(35,43)(36,47)(37,48)(38,42)(39,40)(41,44)(45,46) involution — undirected(1,3,7,4)(2,8,12,9)(5,13,15,11)(6,10,16,14)(17,18)(19,23)(20,29)(21,25)(22,27)(24,28)(26,30)(31,32)(34,40)(35,44)(36,48)(42,46)(1,3,7,4)(2,9,12,8)(5,11,15,13)(6,10,16,14)(17,19)(18,22)(20,26)(21,27)(23,25)(24,30)(28,32)(29,31)(33,35,39,44)(34,41,40,43)(36,45,48,38)(37,46,47,42)(1,4,7,3)(2,9,12,8)(5,13,15,11)(6,10,16,14)(17,19)(18,23)(20,26)(21,27)(22,25)(24,31)(28,32)(29,30)(33,36)(34,37)(35,45)(38,44)(39,48)(40,47)(41,46)(42,43)(1,5,7,15)(2,10,12,14)(3,11,4,13)(6,9,16,8)(17,20)(18,24)(19,26)(21,28)(22,30)(23,31)(25,29)(27,32)(33,37)(34,36)(35,46)(38,43)(39,47)(40,48)(41,45)(42,44)(1,6,7,16)(2,11,12,13)(3,10,4,14)(5,9,15,8)(17,18)(19,22)(20,24)(21,25)(23,27)(26,30)(28,29)(31,32)(33,38,39,45)(34,42,40,46)(35,36,44,48)(37,43,47,41)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.