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