One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,17)(8,22)(9,12)(10,15)(11,16)(13,20)(14,25)(18,30)(19,27)(21,28)(23,29)(24,32)(26,31)(33,35)(34,36) involution — undirected(6,12,16,15)(13,28,17,27)(14,22,32,31)(29,36,33,30)(5,7)(6,13,16,17)(8,23)(9,21)(10,19)(11,20)(12,27,15,28)(14,30,32,36)(18,24)(22,33,31,29)(25,34)(26,35)(2,4)(5,8,9,24,11,26,10,25)(6,14,15,31,16,32,12,22)(7,18,19,23,20,34,21,35)(13,29,27,30,17,33,28,36)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.