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