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