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