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