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