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