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