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