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