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