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