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