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