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