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