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