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