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