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