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