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