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