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