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