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)(13,14,16,18)(15,17,19,20)(22,25)(26,28)(5,7,8,12)(6,9,10,11)(13,15,16,19)(14,17,18,20)(23,27)(26,28)(6,10)(9,11)(13,15)(14,17)(16,19)(18,20)(21,22)(23,26)(24,25)(27,28) involution — undirected(1,2)(3,4)(5,7)(6,9)(8,12)(10,11)(21,23,24,27)(22,26,25,28)(5,6)(7,9)(8,10)(11,12)(13,14)(15,17)(16,18)(19,20) involution — undirectedA 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.