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