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