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