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