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