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