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