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