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