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)(11,14)(12,13)(15,16)(17,18,23,20)(19,28,30,25)(21,29,32,26)(22,31,24,27)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(17,19)(18,25)(20,28)(21,31)(22,29)(23,30)(24,26)(27,32) involution — undirected(1,3,5,4)(2,7,6,8)(10,13)(14,16)(17,20,23,18)(19,28,30,25)(21,29,32,26)(22,27,24,31)(10,13)(14,16)(17,21,24,28,23,32,22,25)(18,26,27,19,20,29,31,30)(1,4,5,3)(2,7,6,8)(9,11,12,15)(10,14,13,16)(17,22,23,24)(18,27,20,31)(19,29,30,26)(21,25,32,28)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.