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)(17,18,24,38,23,29,22,28)(19,30,37,25,34,44,33,41)(20,26,21,27,35,42,36,43)(31,40,47,39,46,48,32,45)(9,11)(10,13)(12,15)(14,16)(17,19)(18,25)(20,31)(21,32)(22,37)(23,34)(24,33)(26,39)(27,40)(28,44)(29,41)(30,38)(35,46)(36,47)(42,45)(43,48) involution — undirected(2,5)(6,8)(11,15)(13,16)(17,20,23,35)(18,26,29,42)(19,31,34,46)(21,22,36,24)(25,39,41,45)(27,28,43,38)(30,40,44,48)(32,37,47,33)(11,15)(13,16)(17,21)(18,27)(19,32)(20,22)(23,36)(24,35)(25,40)(26,28)(29,43)(30,45)(31,37)(33,46)(34,47)(38,42)(39,44)(41,48) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(13,16)(20,35)(21,36)(26,42)(27,43)(31,46)(32,47)(39,45)(40,48)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.