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