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)(18,23)(24,32)(25,27)(26,31) involution — undirected(1,3,6,2)(4,8,5,7)(9,10,12,13)(11,14,15,16)(17,18)(19,27)(20,26)(21,23)(22,31)(24,28)(25,29)(30,32)(1,4,6,5)(2,7,3,8)(9,11,12,15)(10,14,13,16)(17,19)(18,24)(20,28)(21,29)(22,30)(23,32)(25,26)(27,31)(2,3)(7,8)(10,13)(14,16)(17,19)(18,25)(20,30)(21,29)(22,28)(23,27)(24,26)(31,32) involution — undirected(1,5,6,4)(2,8,3,7)(17,20,21,22)(18,26,23,31)(19,28,29,30)(24,25,32,27)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.