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