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