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