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