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