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