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