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