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