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