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