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