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