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