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