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