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