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