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