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