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