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