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