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