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