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