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