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