One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(17,18)(19,27)(20,21)(22,23)(24,30)(25,26)(28,29)(31,32) involution — undirected(3,7)(6,8)(9,10,13,11)(12,15,16,14)(18,23)(21,25)(24,27)(29,32)(1,2)(3,6)(4,5)(7,8)(10,11)(14,15)(17,19,22,30)(18,24,23,27)(20,31,26,28)(21,29,25,32)(9,10,13,11)(12,14,16,15)(17,20,22,26)(18,25,23,21)(19,28,30,31)(24,29,27,32)(1,3,4,7)(2,6,5,8)(9,11,13,10)(12,15,16,14)(17,18)(19,27)(20,25)(21,26)(22,23)(24,30)(28,32)(29,31)(1,2)(3,6)(4,5)(7,8)(9,12,13,16)(10,14,11,15)(17,21,22,25)(18,26,23,20)(19,29,30,32)(24,28,27,31)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.