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