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