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