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