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)(21,22,25,26)(23,27,30,34)(24,31,33,28)(29,36,32,35)(2,4)(13,14,16,18)(15,17,20,19)(22,26)(27,34)(28,31)(35,36)(1,2)(3,4)(13,14)(15,17)(16,18)(19,20)(21,22)(23,27)(24,31)(25,26)(28,33)(29,36)(30,34)(32,35) involution — undirected(5,6)(7,9)(8,10)(11,12)(13,14)(15,17)(16,18)(19,20)(21,23,25,30)(22,27,26,34)(24,32,33,29)(28,36,31,35)(5,7,8,11)(6,9,10,12)(13,15)(14,17)(16,20)(18,19)(21,24,25,33)(22,28,26,31)(23,29,30,32)(27,35,34,36)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.