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