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