One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,12)(5,14)(6,11)(7,8)(10,15)(13,16)(20,28)(24,29)(26,32)(30,31)(34,39)(35,42)(36,44)(45,47) involution — undirected(2,8)(5,15)(9,12)(11,13)(17,18)(19,23)(20,29)(21,25)(22,27)(24,28)(26,30)(31,32)(33,34,38,39)(35,37,42,40)(36,41,44,46)(43,45,48,47)(1,3,7,4)(2,9,8,12)(5,11,15,13)(6,10,16,14)(17,19)(18,22)(20,26)(21,27)(23,25)(24,30)(28,32)(29,31)(33,35,38,42)(34,40,39,37)(36,43,44,48)(41,47,46,45)(1,4,7,3)(2,9,8,12)(5,13,15,11)(6,10,16,14)(17,19)(18,23)(20,26)(21,27)(22,25)(24,31)(28,32)(29,30)(33,34)(35,40)(36,41)(37,42)(38,39)(43,47)(44,46)(45,48)(1,5,7,15)(2,10,8,14)(3,11,4,13)(6,9,16,12)(17,20)(18,24)(19,26)(21,28)(22,30)(23,31)(25,29)(27,32)(33,36)(34,41)(35,43)(37,45)(38,44)(39,46)(40,47)(42,48)(1,6,7,16)(2,11,8,13)(3,10,4,14)(5,9,15,12)(17,18)(19,22)(20,24)(21,25)(23,27)(26,30)(28,29)(31,32)(33,37,38,40)(34,42,39,35)(36,45,44,47)(41,48,46,43)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.