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