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