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