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