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