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