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