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