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