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