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