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