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