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