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