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