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)(7,11,15,20,16,18,17,19)(21,22,24,28,25,29,32,27)(23,26,31,33,30,34,36,35)(1,2,4,3)(5,7,8,17,9,16,10,15)(6,11,13,19,14,18,12,20)(21,23,24,31,25,30,32,36)(22,26,28,33,29,34,27,35)(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)(7,16)(11,18)(15,17)(19,20)(23,30)(26,34)(31,36)(33,35)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.