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