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